Better looking admin widget

Since I am primarily using this for the admin widget functionality, I figured I'd make it look better than an unstyled list. UX features:

- Max-height widget, so lots of items don't take up tons of UI room
- Ellipsis for long rows

Here is the result:

![Screenshot](http://i.imgur.com/9Bjfo7Q.png)

I also included a bit more info and the screenshot in the readme.